Epson WF-4830 Series User Manual page 218

Solving Problems
Blurry Copies, Vertical Banding, or Misalignment
The following causes can be considered.
The print head position is out of alignment.
Solutions
Align the print head using the Print Quality Adjustment feature.
The bidirectional printing setting is enabled.
Solutions
If print quality does not improve even after aligning the print head, disable the bidirectional setting.
During bidirectional (or high speed) printing, the print head prints while moving in both directions, and
vertical lines may be misaligned. Disabling this setting may slow down printing speed but improve print
quality.
Select Settings > General Settings > Printer Settings, and then disable Bidirectional on the control
panel.
Striped Patterns Appear
The bidirectional printing setting is enabled.
Solutions
When printing on plain paper, disable the bidirectional setting.
During bidirectional (or high speed) printing, the print head prints while moving in both directions, and
vertical lines may be misaligned. Disabling this setting may slow down printing speed but improve print
quality.
Select Settings > General Settings > Printer Settings, and then disable Bidirectional on the control
panel.
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Printing, Copying, Scanning, and Faxing Quality is Poor
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Copy Quality is Poor